Patents by Inventor Alois Kolwert

Alois Kolwert has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the production of ethylene-vinyl acetate copolymers, new ethylene/vinyl acetate copolymers and their use
    Patent number: 5089579
    Abstract: Ethylene/vinyl acetate high-pressure bulk polymers having reduced tackiness can be produced by copolymerization of small quantities of an acryloyl or methacryloyl compound.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: February 18, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hubert Sutter, Alois Kolwert, Werner Obrecht
  • Process for the preparation of ethylene/acrylonitrile copolymers, new ethylene/acrylonitrile copolymers and their use
    Patent number: 5036149
    Abstract: Ethylene/acrylonitrile high pressure solvent-free polymers with reduced tackiness may be obtained by the copolymerisation of small quantities of acryloyl or methacryloyl compounds.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: July 30, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Obrecht, Szolt Szentivanyi, Hubert Sutter, Jens Herwig, Alois Kolwert
  • Ionomer-modified polyethylene as film material
    Patent number: 4882393
    Abstract: An ionomer-modified polyethylene, that is, an ethylene/carboxylic acid copolymer in which at least some of the acidic groups are neutralized, is preparable by a one-stage procedure by reacting ethylene with unsaturated carboxylic acids and salts of such unsaturated carboxylic acids in the presence of a free radical polymerization initiator, under the conditions employed in the production of high pressure polyethylene (LDPE). The concentration of salt which is incorporated in the polymer is kept at no more than 1 mol %, relative to converted ethylene and other comonomers respectively. Advantageously, the unsaturated carboxylic acids and their salts are added to the copolymerization reaction as a homogeneous solution in a suitable solvent.The ionomer-modified polyethylenes based on low density polyethylene (LDPE), in which 30-95% of the carboxyl groups are neutralized and the neutralized carboxyl groups represent 0.1-0.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: November 21, 1989
    Assignee: EC Erdoelchemie GmbH
    Inventors: Jens Herwig, Alois Kolwert, Hubert Sutter, Dieter Woltjes